function testMakeHilbert()
 {
     $data = array(array(1, 1 / 2, 1 / 3), array(1 / 2, 1 / 3, 1 / 4), array(1 / 3, 1 / 4, 1 / 5));
     $res = new Math_Matrix($data);
     $hilb = Math_Matrix::makeHilbert(3);
     $this->assertEquals($res->toString(), $hilb->toString());
 }